lily/tie-performer.cc

   1 /*
   2   tie-performer.cc -- implement Tie_performer
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 1998--2006 Han-Wen Nienhuys <hanwen@xs4all.nl>
   7 */
   8
   9 #include "performer.hh"
  10
  11 #include "audio-item.hh"
  12 #include "context.hh"
  13 #include "pqueue.hh"
  14 #include "stream-event.hh"
  15 #include "translator.icc"
  16
  17 class Tie_performer : public Performer
  18 {
  19   Stream_event *event_;
  20   Stream_event *last_event_;
  21   vector<Audio_element_info> now_heads_;
  22   vector<Audio_element_info> heads_to_tie_;
  23
  24   bool ties_created_;
  25
  26 protected:
  27   void stop_translation_timestep ();
  28   void start_translation_timestep ();
  29   virtual void acknowledge_audio_element (Audio_element_info);
  30   void process_music ();
  31   DECLARE_TRANSLATOR_LISTENER (tie);
  32 public:
  33   TRANSLATOR_DECLARATIONS (Tie_performer);
  34 };
  35
  36 Tie_performer::Tie_performer ()
  37 {
  38   event_ = 0;
  39   last_event_ = 0;
  40   ties_created_ = false;
  41 }
  42
  43 IMPLEMENT_TRANSLATOR_LISTENER (Tie_performer, tie);
  44 void
  45 Tie_performer::listen_tie (Stream_event *ev)
  46 {
  47   event_ = ev;
  48 }
  49
  50 void
  51 Tie_performer::process_music ()
  52 {
  53   if (event_)
  54     context ()->set_property ("tieMelismaBusy", SCM_BOOL_T);
  55 }
  56
  57 void
  58 Tie_performer::acknowledge_audio_element (Audio_element_info inf)
  59 {
  60   if (Audio_note *an = dynamic_cast<Audio_note *> (inf.elem_))
  61     {
  62       now_heads_.push_back (inf);
  63       for (vsize i = heads_to_tie_.size (); i--;)
  64         {
  65           Stream_event *right_mus = inf.event_;
  66
  67           Audio_note *th = dynamic_cast<Audio_note *> (heads_to_tie_[i].elem_);
  68           Stream_event *left_mus = heads_to_tie_[i].event_;
  69
  70           if (right_mus && left_mus
  71               && ly_is_equal (right_mus->get_property ("pitch"),
  72                               left_mus->get_property ("pitch")))
  73             {
  74               an->tie_to (th);
  75               ties_created_ = true;
  76             }
  77         }
  78     }
  79 }
  80
  81 void
  82 Tie_performer::start_translation_timestep ()
  83 {
  84   context ()->set_property ("tieMelismaBusy",
  85                             ly_bool2scm (heads_to_tie_.size ()));
  86 }
  87
  88 void
  89 Tie_performer::stop_translation_timestep ()
  90 {
  91   if (ties_created_)
  92     {
  93       heads_to_tie_.clear ();
  94       last_event_ = 0;
  95       ties_created_ = false;
  96     }
  97
  98   if (event_)
  99     {
 100       heads_to_tie_ = now_heads_;
 101       last_event_ = event_;
 102     }
 103   event_ = 0;
 104   now_heads_.clear ();
 105 }
 106
 107 ADD_TRANSLATOR (Tie_performer,
 108                 /* doc */ "Generate ties between noteheads of equal pitch.",
 109                 /* create */ "",
 110                 /* accept */ "tie-event",
 111                 /* read */ "tieMelismaBusy",
 112                 /* write */ "");